Difficult sudoku #2636
| 4 | ||||||||
| 9 | 3 | |||||||
| 2 | 6 | 5 | ||||||
| 6 | 2 | 8 | 9 | |||||
| 4 | ||||||||
| 6 | 3 | |||||||
| 3 | 8 | |||||||
| 7 | 5 | 4 | 9 | |||||
| 8 | 1 | 9 |
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